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codemirror_attach.js
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codemirror_attach.js
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(function () {
var applyToShareJS;
var preActionCodemirrorContent;
applyToShareJS = function (editorDoc, delta, doc) {
var pos, text;
change = delta;
while (1) {
pos = myIndexFromPos(change.from.line, change.from.ch, preActionCodemirrorContent);
end_pos = myIndexFromPos(change.to.line, change.to.ch, preActionCodemirrorContent);
action = '';
if (change.text[0] == "" && change.text.length == 1) {
if (change.from.line != change.to.line)
action = 'removeLines';
else
action = 'removeText';
}
else {
if (change.text.length > 1)
action = 'insertLines';
else
action = 'insertText';
}
switch (action) {
case 'insertText':
if (pos != end_pos)
doc.del(pos, end_pos - pos);
doc.insert(pos, change.text[0]);
break;
case 'removeText':
doc.del(pos, end_pos - pos);
break;
case 'insertLines':
if (pos != end_pos)
doc.del(pos, end_pos - pos);
text = change.text.join('\n');
doc.insert(pos, text);
break;
case 'removeLines':
doc.del(pos, end_pos - pos);
break;
default:
throw new Error("unknown action: " + delta.action);
}
preActionCodemirrorContent = doc.getText();
if (!change.next)
break;
change = change.next;
}
};
window.sharejs.Doc.prototype.attach_codemirror = function (editor, keepEditorContents) {
var check, doc, editorDoc, editorListener, suppress;
if (!this.provides['text']) {
throw new Error('Only text documents can be attached to CodeMirror');
}
doc = this;
editorDoc = editor;
check = function () {
return window.setTimeout(function () {
var editorText, otText;
editorText = editorDoc.getValue();
otText = doc.getText();
if (editorText !== otText) {
console.error("Texts are out of sync. Most likely this is caused by a bug in this code.");
}
}, 0);
};
if (keepEditorContents) {
doc.del(0, doc.getText().length);
doc.insert(0, editorDoc.getValue());
} else {
editorDoc.setValue(doc.getText());
}
preActionCodemirrorContent = editorDoc.getValue();
check();
suppress = false;
editorListener = function (change, tc) {
if (suppress) return;
applyToShareJS(editorDoc, tc, doc);
return check();
};
editorDoc.setOption("onChange", editorListener);
myIndexFromPos = function (line, ch, value) {
myIndex = 0;
count = 0;
lines = value.split("\n");
for (i = 0; i < lines.length; i++) {
if (count < line)
myIndex += lines[i].length + 1
else {
myIndex += ch;
break;
}
count++;
}
return myIndex;
}
doc.on('insert', function (pos, text) {
suppress = true;
start = editorDoc.posFromIndex(pos);
editorDoc.replaceRange(text, start);
suppress = false;
preActionCodemirrorContent = editorDoc.getValue();
return check();
});
doc.on('delete', function (pos, text) {
var range;
suppress = true;
start = editorDoc.posFromIndex(pos);
end = editorDoc.posFromIndex(pos + text.length);
editorDoc.replaceRange("", start, end);
suppress = false;
preActionCodemirrorContent = editorDoc.getValue();
return check();
});
doc.detach_codemirror = function () {
editorDoc.removeListener('change', editorListener);
return delete doc.detach_codemirror;
};
};
}).call(this);